Operation Guide 3172
Display Units
You can select either hectopascals (hPa) or inchesHg (inHg) as the display unit for the measured barometric pressure, and Celsius (°C) or Fahrenheit (°F) as the display unit for the measured temperature value. See “To specify temperature, barometric pressure, and altitude units”.
Barometric Pressure Graph
Barometric | Barometric pressure indicates changes in the atmosphere. By monitoring | |||
these changes you can predict the weather with reasonable accuracy. | ||||
pressure graph | ||||
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| This watch takes barometric pressure measurements automatically every | |
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| two hours (at the 30th minute of every even numbered hour). | |
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| Measurement results are used to produce barometric pressure graph and | |
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| barometric pressure differential pointer readings. | |
Reading the Barometric Pressure Graph
The barometric pressure graph shows readings of previous measurements for up to 24 hours.
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| • The horizontal axis of the graph represents time, with each dot |
Barometric |
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| standing for two hours. The rightmost dot represents the most recent |
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| reading. | |
pressure |
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| • The vertical axis of the graph represents barometric pressure, with |
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| each dot standing for the relative difference between its reading and |
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| Time | that of the dots next to it. Each dot represents 1 hPa. | |
The following shows how to interpret the data that appears on the barometric pressure graph.
A rising graph generally means improving weather.
Barometer and Thermometer Precautions
•The pressure sensor built into this watch measures changes in air pressure, which you can then apply to your own weather predictions. It is not intended for use as a precision instrument in official weather prediction or reporting applications.
•Sudden temperature changes can affect pressure sensor readings.
•Temperature measurements are affected by your body temperature (while you are wearing the watch), direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch from your wrist, place it in a well ventilated location out of direct sunlight, and wipe all moisture from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding temperature.
Altimeter
The watch displays altitude values based on air pressure readings taken by a
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values (initial default method) or using a reference altitude specified by you.
When you measure altitude based on preset values
Data produced by the watch’s barometric pressure sensor is converted to approximate altitude based on ISA (International Standard Atmosphere) conversion values stored in watch memory.
When you measure altitude using a reference altitude specified by you
After you specify a reference altitude, the watch uses that value to convert |
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barometric pressure readings to altitude. | B |
• When mountain climbing, you can specify a reference altitude value in |
A falling graph generally means deteriorating weather.
Note
• If there are sudden changes in weather or temperature, the graph line of past |
accordance with a marker along the way or altitude information from a | A |
map. After that, the altitude readings produced by the watch will be more | |
accurate than they would without a reference altitude value. | 400 |
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To take an altimeter reading |
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measurements may run off the top or bottom of the display. The entire graph will |
become visible once barometric conditions stabilize. |
• The following conditions cause the barometric pressure measurement to be |
skipped, with the corresponding point on the barometric pressure graph being |
left blank. |
– Barometric reading that is out of range (260 hPa to 1,100 hPa or 7.65 inHg to |
32.45 inHg) |
– Sensor malfunction |
Not visible on the display.
Altitude Altitude
graph differential
1. | Make sure the watch is in the Timekeeping Mode or any one of the |
| sensor modes. |
| • The sensor modes are: Digital Compass Mode, Barometer/ |
| Thermometer Mode, and Altimeter Mode. |
2. | Press A to start Altimeter measurement. |
| • ALTI will appear on the display, indicating that Altimeter |
| measurement is in progress. The first reading will appear on the |
| display after about four or five seconds. |
| • The current altitude value is displayed in units of 5 meters (20 feet). |
Barometric Pressure Differential Pointer
| This pointer indicates the relative difference between the most recent | |
Barometric | barometric pressure reading indicated on the barometric pressure graph, | |
and the current barometric pressure value displayed in the Barometer/ | ||
pressure | ||
differential | Thermometer Mode. | |
pointer |
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Current |
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altitude | Current time |
• After the first reading is obtained, the watch continues to take |
altimeter readings automatically every five seconds for the first |
three minutes, and then every two minutes after that (under initial |
default settings). |
• If you leave the watch in the Altimeter Mode, it will update the |
displayed altitude value regularly and indicate |
changes in graph form. |
• You can use the procedure under “Selecting an Altitude Auto |
Reading Barometric Pressure Differential Pointer
Pressure differential is indicated in the range of | inHg values |
±10 hPa, in |
•The nearby screen shot, for example, shows
what the pointer would indicate when the | hPa values |
calculated pressure differential is |
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approximately – 5 hPa (approximately – 0.15 |
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inHg). |
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• Barometric pressure is calculated and |
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displayed using hPa as the standard. The |
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barometric pressure differential also can be |
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read in inHg units as shown in the illustration |
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(1 hPa = 0.03 inHg). |
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| Barometric pressure |
| differential pointer |
Current pressure greater than most
recent measured pressure
−5
−0.15
−10
Current pressure
−0.3 less than most 
recent measured
pressure
Measurement Method” to specify the altitude auto measurement |
method you want to use. |
3. After you are finished using the Altimeter, press D to return to the |
Timekeeping Mode and stop auto measurement. |
• The watch will return to the Timekeeping Mode automatically if you |
do not perform any operation for about 24 hours after entering the |
Altimeter Mode (under initial default settings). |
Reading the Altitude Graph
The altitude graph shows Altimeter Mode auto measurement readings over time.
Latest |
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| • The vertical axis of the graph represents altitude, and each dot stands | |||||
reading |
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| for 10 meters (40 feet). | |||
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| • The horizontal axis represents time. For the altitude readings taken |
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| Altitude | during the first three minutes after you start an altimeter measurement |
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| operation, each dot represents five seconds. After that, each dot | |
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| represents two minutes (under initial default settings). |
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| • An out of range reading or a measurement error will cause the column |
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| Time |
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| of dots for that reading to be blank (skipped). | ||||
Note
Pressure Sensor and Temperature Sensor Calibration
The pressure sensor and temperature sensor built into the watch are calibrated at the factory and normally require no further adjustment. If you notice serious errors in the pressure readings and temperature readings produced by the watch, you can calibrate the sensor to correct the errors.
Important!
•Incorrectly calibrating the barometric pressure sensor can result in incorrect readings. Before performing the calibration procedure, compare the readings produced by the watch with those of another reliable and accurate barometer.
•Incorrectly calibrating the temperature sensor can result in incorrect readings. Carefully read the following before doing anything.
–Compare the readings produced by the watch with those of another reliable and accurate thermometer.
–If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the temperature of the watch time to stabilize.
To calibrate the pressure sensor and the temperature sensor
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| 1. While in the Timekeeping Mode or in any of the sensor modes, press B | ||
| l | to enter the Barometer/Thermometer Mode. | |||
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| l | 2. Hold down E until the current temperature value starts to flash on the | |
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| l l l l | display. This is the setting screen. | ||
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| • Before the temperature value starts to flash, the message SET | |
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| Hold will appear on the display. Keep E depressed until SET Hold | |
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| disappears. |
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| 3. Press D to move the flashing between the temperature value and | |
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| barometric pressure value, to select the one you want to calibrate. | |
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| 4. Use A (+) and C | |
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| Temperature | 0.1°C (0.2°F) |
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| Barometric Pressure | 1 hPa (0.05 inHg) | |
| l | • To return the currently flashing value to its initial factory default setting, | |||
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| press A and C at the same time. OFF will appear at the flashing | |||
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| l | location for about one second, followed by the initial default value. | |
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| l | 5. Press E to return to the Barometer/Thermometer Mode screen. | ||
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•The measurement range for altitude is
•The displayed altitude value changes to - - - if an altitude reading falls outside the measurement range. An altitude value will reappear as soon as the altitude reading is within the allowable range.
•Normally, displayed altitude values are based on the watch’s preset conversion values. You also can specify a reference altitude value, if you want. See “Specifying a Reference Altitude Value”.
•You can change the unit for displayed altitude values to either meters (m) or feet (ft). See “To specify temperature, barometric pressure, and altitude units”.
Selecting an Altitude Auto Measurement Method
You can select either of the following two altitude auto measurement methods. 0’05: Readings at
2’00: Readings at
Note
If you do not perform any button operation while in the Altimeter Mode, the watch will return to the Timekeeping Mode automatically after 24 hours (altitude auto measurement method: 2’00) or after one hour (altitude auto measurement method: 0’05).
To select the altitude auto measurement method
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| 1. | In the Altimeter Mode, hold down E until the current reference altitude |
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| value starts to flash. This is the setting screen. | |
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| • Before the reference altitude starts to flash, the message SET | ||
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| Hold will appear on the display. Keep E depressed until SET |
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| Hold disappears. |
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| l | 2. | Press D to display the current altitude auto measurement method |
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| setting. | ||
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| • This will cause either 0’05 or 2’00 to flash on the display. |
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| 3. | Press A to toggle the altitude auto measurement method setting |
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| between 0’05 and 2’00. |
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| 4. | Press E to exit the setting screen. |
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